GB1500705A - Circular magnetic domain devices - Google Patents

Circular magnetic domain devices

Info

Publication number
GB1500705A
GB1500705A GB19205/74A GB1920574A GB1500705A GB 1500705 A GB1500705 A GB 1500705A GB 19205/74 A GB19205/74 A GB 19205/74A GB 1920574 A GB1920574 A GB 1920574A GB 1500705 A GB1500705 A GB 1500705A
Authority
GB
United Kingdom
Prior art keywords
bubbles
bubble
conductor
elements
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB19205/74A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB19205/74A priority Critical patent/GB1500705A/en
Priority to US05/572,875 priority patent/US4052708A/en
Publication of GB1500705A publication Critical patent/GB1500705A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
    • G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
    • G11C19/08—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure
    • G11C19/0875—Organisation of a plurality of magnetic shift registers
    • G11C19/0883—Means for switching magnetic domains from one path into another path, i.e. transfer switches, swap gates or decoders
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
    • G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
    • G11C19/08—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure
    • G11C19/0808—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure using magnetic domain propagation
    • G11C19/0816—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure using magnetic domain propagation using a rotating or alternating coplanar magnetic field

Landscapes

  • Magnetic Resonance Imaging Apparatus (AREA)
  • Magnetic Treatment Devices (AREA)

Abstract

1500705 Magnetic bubble switches PLESSEY CO Ltd 17 March 1975 [2 May 1974] 19205/74 Heading H3B Magnetic bubbles are switched from one track 6 to at least one of two others 8, 9 by the combined effect of at least three permeable elements 12-14 allowing bubble expansion and a magnetic field impulse generator, i.e. conductor 15, encompassing at least the central element or elements 13. Normally bubbles moving in direction 17 by a 100 kHz rotating field 16 expand over elements D-G then contract over element H along track 9 in direction 19. However, a 1 Ásec., 60 mA pulse applied to conductor 15 erases the central part of an expanded bubble to split it and cause the divided sections to propagate along tracks 8 and 9, whereas a 3 Ásec., 40 mA pulse before a bubble reaches element E diverts it along track 8. Alternatively the conductor 15 may annihilate bubbles. The switch shown may be combined with another rotated 180 degrees from that shown to allow transfer of bubbles between loops (Fig. 4, not shown), and the conductor 15 may have inverted extensions to one or both limbs to encircle the outer elements 12, 14. The bubbles are originally created by splitting off from a bubble captive to a permalloy disc.
GB19205/74A 1974-05-02 1974-05-02 Circular magnetic domain devices Expired GB1500705A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB19205/74A GB1500705A (en) 1974-05-02 1974-05-02 Circular magnetic domain devices
US05/572,875 US4052708A (en) 1974-05-02 1975-04-29 Circular magnetic domain devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19205/74A GB1500705A (en) 1974-05-02 1974-05-02 Circular magnetic domain devices

Publications (1)

Publication Number Publication Date
GB1500705A true GB1500705A (en) 1978-02-08

Family

ID=10125482

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19205/74A Expired GB1500705A (en) 1974-05-02 1974-05-02 Circular magnetic domain devices

Country Status (2)

Country Link
US (1) US4052708A (en)
GB (1) GB1500705A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164028A (en) * 1977-06-09 1979-08-07 International Business Machines Corporation Current access bubble memory system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3723716A (en) * 1971-07-08 1973-03-27 Bell Telephone Labor Inc Single wall domain arrangement including fine-grained, field access pattern
US3797001A (en) * 1972-08-07 1974-03-12 Bell Telephone Labor Inc Single wall domain propagation arrangement
US3781833A (en) * 1972-08-29 1973-12-25 Bell Telephone Labor Inc Single wall magnetic domain generator
US3876995A (en) * 1973-08-08 1975-04-08 Hewlett Packard Co Magnetic bubble switches

Also Published As

Publication number Publication date
US4052708A (en) 1977-10-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee